At least it's not late for the other dog. Poor guy although he was the agressor it's a great thing he'll be trained because that will prevent him from getting in trouble and also hurting other dogs.

Marty was growling at dog he does not know today and he never did that before. So this has affected my dog more than I realize. I am concerned about my dog going to playgroup now. I have no idea if training will help the other dog be less aggressive, I guess it depend on what cause the dog to be this way in the first place.